118 lines
4.5 KiB
C
118 lines
4.5 KiB
C
#ifndef NDO_LIBNAGIOS_RUNCMD_H_INCLUDED
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#define NDO_LIBNAGIOS_RUNCMD_H_INCLUDED
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#include <signal.h>
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/**
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* @file runcmd.h
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* @brief runcmd library function declarations
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*
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* A simple interface to executing programs from other programs, using an
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* optimized and safer popen()-like implementation. It is considered safer in
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* that no shell needs to be spawned for simple commands, and the environment
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* passed to the execve()'d program is essentially empty.
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*
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* This code is based on popen.c, which in turn was taken from
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* "Advanced Programming in the UNIX Environment" by W. Richard Stevens.
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*
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* Care has been taken to make sure the functions are async-safe. The exception
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* is runcmd_init() which multithreaded applications or plugins must call in a
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* non-reentrant manner before calling any other runcmd function.
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*
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* @note This is inherited from the nagiosplugins project, although
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* it might need refactoring for performance later.
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* @{
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*/
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/** Return code bitflags for runcmd_cmd2strv() */
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#define RUNCMD_HAS_REDIR (1 << 0) /**< I/O redirection */
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#define RUNCMD_HAS_SUBCOMMAND (1 << 1) /**< subcommands present */
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#define RUNCMD_HAS_PAREN (1 << 2) /**< parentheses present in command */
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#define RUNCMD_HAS_JOBCONTROL (1 << 3) /**< job control stuff present */
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#define RUNCMD_HAS_UBSQ (1 << 4) /**< unbalanced single quotes */
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#define RUNCMD_HAS_UBDQ (1 << 5) /**< unbalanced double quotes */
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#define RUNCMD_HAS_WILDCARD (1 << 6) /**< wildcards present */
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#define RUNCMD_HAS_SHVAR (1 << 7) /**< shell variables present */
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#define RUNCMD_EFD (-1) /**< Failed to pipe() or open() */
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#define RUNCMD_EALLOC (-2) /**< Failed to alloc */
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#define RUNCMD_ECMD (-3) /**< Bad command */
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#define RUNCMD_EFORK (-4) /**< Failed to fork() */
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#define RUNCMD_EINVAL (-5) /**< Invalid parameters */
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#define RUNCMD_EWAIT (-6) /**< Failed to wait() */
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/**
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* Initialize the runcmd library.
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*
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* Only multi-threaded programs that might launch the first external
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* program from multiple threads simultaneously need to bother with
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* this, and they must ensure this is called at least once in a non-reentrant
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* manner before calling any other runcmd function.
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*/
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extern void runcmd_init(void);
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/**
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* Return pid of a command with a specific file descriptor
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* @param[in] fd stdout filedescriptor of the child to get pid from
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* @return pid of the child, or 0 on errors
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*/
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extern pid_t runcmd_pid(int fd);
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/**
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* Return explanation of which system call or operation failed
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* @param code Error code returned by a library function
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* @return A non-free()'able string explaining where the error occurred
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*/
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extern const char *runcmd_strerror(int code);
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/**
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* Start a command from a command string
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* @param[in] cmd The command to launch
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* @param[out] pfd Child's stdout filedescriptor
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* @param[out] pfderr Child's stderr filedescriptor
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* @param[in] env Currently ignored for portability
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* @param[in] iobreg The callback function to register the iobrokers for the read ends of the pipe
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* @param[in] iobregarg The "arg" value to pass to iobroker_register()
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*/
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extern int runcmd_open(const char *cmd, int *pfd, int *pfderr, char **env,
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void (*iobreg)(int, int, void *), void *iobregarg)
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__attribute__((__nonnull__(1, 2, 3, 5, 6)));
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/**
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* Close a command and return its exit status
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* @note Don't use this. It's a retarded way to reap children suitable
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* only for launching a one-shot program.
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*
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* @param[in] fd The child's stdout filedescriptor
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* @return exit-status of the child, or -1 in case of errors
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*/
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extern int runcmd_close(int fd);
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/**
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* Convert a string to a vector of arguments like a shell would
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* @note This might have bugs and is only tested to behave similar
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* to how /bin/sh does things. For csh or other non bash-ish shells
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* there are no guarantees.
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* @note The out_argv array has to be large enough to hold all strings
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* found in the command.
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* @param[in] str The string to convert to an argument vector
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* @param[out] out_argc The number of arguments found
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* @param[out] out_argv The argument vector
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* @return 0 on (great) success, or a bitmask of failure-codes
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* representing f.e. unclosed quotes, job control or output redirection.
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* See the RUNCMD_HAS_* and their ilk to find out about the flag.
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*/
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extern int runcmd_cmd2strv(const char *str, int *out_argc, char **out_argv);
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/**
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* If you're using libnagios to execute a remote command, the
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* static pid_t pids is not freed after runcmd_open
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* You can call this function when you're sure pids is no longer
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* in use, to keep down memory leaks
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*/
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extern void runcmd_free_pids(void);
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/** @} */
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/* INCLUDE_runcmd_h__ */
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#endif
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