exec系列函数

最新推荐文章于 2023-10-18 16:28:32 发布

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本文详细介绍了Linux系统中用于启动新进程的各种函数，如execl、execle、execv等，并解释了它们之间的区别，包括参数传递方式及环境变量设置。

int execl (const char *path,
const char *arg,
...);
int execlp (const char *file,
const char *arg,
...);
Running a New Process | 131
int execle (const char *path,
const char *arg,
...,
char * const envp[]);
int execv (const char *path, char *const argv[]);
int execvp (const char *file, char *const argv[]);
int execve (const char *filename,
char *const argv[],
char *const envp[]);

The mnemonics are simple. The l and v delineate whether the arguments are provided
via a list or an array (vector). The p denotes that the user’s full path is searched for the
given file. Commands using the p variants can specify just a filename, so long as it is
located in the user’s path. Finally, the e notes that a new environment is also supplied
for the new process. Curiously, although there is no technical reason for the omission,
the exec family contains no member that both searches the path and takes a new environment.
This is probably because the p variants were implemented for use by shells,
and shell-executed processes generally inherit their environments from the shell.

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