某模块作为前台进程独立运行时,运行命令携带命令行参数;作为某平台下守护进程子进程运行时,需要将命令行参数固化在代码里。类似如下写法:
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char *argv[] = {"./DslDriver", "-t", "/bin/VdslModemSco.bin"}; int argc = sizeof(argv) / sizeof(argv[0]); |
随后,调用basename函数(头文件为libgen.h)解析argv[0],即"./DslDriver"。实测发现,在Linux原生系统中解析正常,在某平台下解析时则会发生段错误。
合理的想法自然是怀疑两种环境下basename函数的实现不同。Linux原生函数源码未找到,但某平台uclibc源码中可以找到basename函数的实现:
1 /* Return final component of PATH. 2 This is the weird XPG version of this function. It sometimes will 3 modify its argument. Therefore we normally use the GNU version (in 4 <string.h>) and only if this header is included make the XPG 5 version available under the real name. */ 6 extern char *__xpg_basename (char *__path) __THROW; 7 #define basename __xpg_basename